1989 300TE wagon alarm system I need to disable it?
 

1989 300TE wagon alarm system I need to disable it? I got the car few weeks ago, I didn't know it has factory alarm on it, after few week in cold weatherit some how automaticlly turn on when I open the door, since then , it can not be turn off, due to I don't have the remote or the lock key for the doors only the start key. I did take off the loud horn to stop the noise but the flashing lights still on for more than 5 mins before it stop, can not drive it with all the light flashing?
any adviss will do to stop this flashing will help. thanks advance.
jim